I bought this to feed my community tank with frozen food cubes. The suction cup sticks very well to the glass. The cup has a small protrusion that inserts into the suction cup and I found that it tended to pop out and drop the cup. I ended up putting a dab of super glue on the edge and now it's holding great. I find the holes in the cup a bit small for some frozen foods, but it suits me.
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